Implement CLI flag, --errorForFailures

Author: jugglinmike

README.md

@@ -57,6 +57,7 @@ test262-harness --hostType=X --hostPath=`which X` test/**/*.js
 | `--acceptVersion` | Execute tests from a version of Test262 that differs from the versions supported by this utility. This may cause the utility to report invalid test results. | No | Inferred from `test262Dir/package.json` |
 | `--saveCompiledTests` | Write the compiled version of `path/to/test.js` as `path/to/test.js.<hostType>.<default\|strict>.<pass\|fail>` so that it can be easily re-run under that host. Run `test262-harness --help` for examples. | No | n/a 
 | `--saveOnlyFailed` | Only save the compiled version of the test if it failed, to help easily repro failed tests (implies `--saveCompiledTests`). | No | n/a 
+| `--errorForFailures` | Return a non-zero exit code if one or more tests fail. | No | n/a
 
 
 ### Preprocessor

bin/run.js

@@ -178,6 +178,13 @@ const results = zip(pool, tests).pipe(
 );
 
 const emitter = new ResultsEmitter(results);
+
+if (argv.errorForFailures) {
+  emitter.on('fail', function () {
+    process.exitCode = 1;
+  });
+}
+
 reporter(emitter, reporterOpts);
 
 function printVersion() {

lib/cli.js

@@ -37,6 +37,7 @@ const yargv = yargs
   .describe('saveCompiledTests', 'Write the compiled version of path/to/test.js as path/to/test.js.<hostType>.<default|strict>.<pass|fail> so that it can be easily re-run under that host')
   .boolean('saveOnlyFailed')
   .describe('saveOnlyFailed', 'Only save the compiled version of the test if it failed, to help easily repro failed tests (implies --saveCompiledTests)')
+  .describe('errorForFailures', 'Return a non-zero exit code if one or more tests fail')
   .example('test262-harness path/to/test.js')
   .example('test262-harness --hostType ch --hostPath path/to/host path/to/test262/test/folder/**/*.js')
   .example('test262-harness --hostType ch --hostPath path/to/host --saveCompiledTests path/to/test262/test/folder/**/*.js')

test/test.js

@@ -11,6 +11,12 @@ const tests = [
     ],
     { cwd: 'test/collateral-with-harness/test262' },
   ],
+  [
+    [
+      'test/**/*.js', '--error-for-failures',
+    ],
+    { cwd: 'test/collateral-with-harness/test262' },
+  ],
   [
     [
       '--test262Dir', './test/collateral-with-harness/test262',
@@ -117,6 +123,16 @@ const tests = [
       './test/collateral-preprocessor/test/autofail.js',
     ],
   ],
+  [
+    [
+      '--includesDir', './test/test-includes',
+      '--preprocessor', './test/preprocessor/autofail.js',
+      '--reporter-keys', 'attrs,result,rawResult',
+      './test/collateral-preprocessor/test/autofail.js',
+      '--errorForFailures',
+    ],
+    { exitCode: 1 },
+  ],
 ].reduce((accum, a) => {
   let b = a.slice();